MC34701 查看數據表（PDF） - Freescale Semiconductor

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MC34701

1.5A Switch-Mode Power Supply with Linear Regulator

Freescale Semiconductor 

PIN CONNECTIONS

Table 1. Pin Function Description (continued)

A functional description of each pin can be found in the FUNCTIONAL PIN DESCRIPTION section beginning on page 16.

Pin

Pin Name

Formal Name

Definition

20

CS

Current Sense

Current sense pin of the LDO. Over-current protection of the linear regulator external

power MOSFET. The voltage drop over the LDO current sense resistor RS is sensed

between the CS and LDO pins. The LDO current limit can be adjusted by selecting

the proper value of the current sensing resistor RS.

21

LDRV

Linear Drive

LDO gate drive of the external pass N-channel MOSFET.

22

VIN1

Input Voltage 1

The input supply pin for the integrated circuit. The internal circuits of the IC are

supplied through this pin.

23

VDDI

26

ADDR

Power Supply

Address

Internal supply voltage. A ceramic low ESR 1uF 6V X5R or X7R capacitor is

recommended.

I2C address selection. This pin can either be left open, tied to VDDI, or grounded

through a 10kΩ resistor.

27

EN1

Enable 1

Enable 1 Input. The combination of the logic state of the Enable 1 and Enable 2

inputs determines operation mode and type of power sequencing of the IC.

28

EN2

Enable 2

Enable 2 Input. The combination of the logic state of the Enable 1 and Enable 2

inputs determines operation mode and type of power sequencing of the IC.

29

RT

Reset Timer

This pin allows programming of the power-ON reset delay by means of an external

RC network.

30

RST

Reset Output

(Active LOW)

The reset control circuit monitors both the switching regulator and the LDO feedback

voltages. It is an open drain output and has to be pulled up to some supply voltage

(e.g., the output of the LDO) by an external resistor.

31

CLKSEL

Clock Selection

This pin sets the CLKSYN pin as either an oscillator output or a synchronization input

pin. The CLKSEL pin is also used for the I2C address selection.

32

CLKSYN

Clock Synchronization Oscillator output/synchronization input pin.

34701

4

Analog Integrated Circuit Device Data

Freescale Semiconductor

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